diff --git a/config-miner.lua b/config-miner.lua
new file mode 100644
index 0000000..d5a0248
--- /dev/null
+++ b/config-miner.lua
@@ -0,0 +1,6 @@
+return {
+  startY = 101,
+  targetY = 101,
+  height = 1,
+  size = 2 -- should not be odd
+}
\ No newline at end of file
diff --git a/install.lua b/install.lua
index c9f8c08..a0cdea2 100644
--- a/install.lua
+++ b/install.lua
@@ -4,6 +4,11 @@ local LIST_FILES = {
   'miner.lua'
 };
 
+local LIST_CONFIG_FILES = {
+  'config-miner.lua'
+}
+
+
 local REPO_PREFIX = 'https://git.trapcloud.fr/guillaumearm/minecraft-cc-tools/raw/branch/master/'
 
 local previousDir = shell.dir()
@@ -13,4 +18,11 @@ for _, filePath in pairs(LIST_FILES) do
   shell.execute('wget', REPO_PREFIX .. filePath, filePath)
 end
 
+-- do not override existing config files
+for _, filePath in pairs(LIST_CONFIG_FILES) do
+  if not fs.exists(filePath) then
+    shell.execute('wget', REPO_PREFIX .. filePath, filePath)
+  end
+end
+
 shell.setDir(previousDir)
diff --git a/miner.lua b/miner.lua
index 7dfa477..1f37c1a 100644
--- a/miner.lua
+++ b/miner.lua
@@ -1,12 +1,6 @@
 local robotApi = require('robot')
 local turtleUtils = require('turtle-utils')
-
-local config = {
-  startY = 109,
-  targetY = 109,
-  height = 4,
-  size = 16
-}
+local config = require('config-miner')
 
 local LOWER_SIZE_LIMIT = 2;
 local HIGHER_SIZE_LIMIT = 128;
@@ -20,7 +14,6 @@ local MAX_X = TARGET_X
 local MAX_Y = INITIAL_TARGET_Y + (config.height - 1)
 local MAX_Z = TARGET_Z
 
-
 local robot = robotApi.create()
 
 local MAX_INVENTORY_BLOCKS = 16 * 64